Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual distrito é o atual Frank Chelf?
 ###Tabelas: CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Result VARCHAR, Candidates VARCHAR) CREATE TABLE coaching_history (coaching_history_id AUTO_INCREMENT PRIMARY KEY, Name (Alma Mater) VARCHAR, Seasons VARCHAR, Games INT, Wins INT, Losses INT, Win % VARCHAR, NCAA Tour VARCHAR, NIT Tour VARCHAR, MCC Tour VARCHAR, A-10 Tour VARCHAR) CREATE TABLE ladies_european_tour_career_summary (ladies_european_tour_career_summary_id AUTO_INCREMENT PRIMARY KEY, Year INT, Tournaments played INT, Cuts made INT, Wins INT, 2nd INT, 3rd INT, Top 10s INT, Best finish VARCHAR, Earnings ( € ) VARCHAR, Money list rank VARCHAR, Scoring average VARCHAR, Scoring rank VARCHAR, Rolex ranking INT) CREATE TABLE route_and_stages (route_and_stages_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Course VARCHAR, Distance VARCHAR, Type VARCHAR, Winner VARCHAR) CREATE TABLE train_services (train_services_id AUTO_INCREMENT PRIMARY KEY, Train No. VARCHAR, Train Name VARCHAR, Origin VARCHAR, Destination VARCHAR, Frequency VARCHAR)  
SELECT District FROM  WHERE Incumbent = Frank Chelf